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NAME

       statvfs, fstatvfs - get file system statistics

SYNOPSIS

       #include <sys/statvfs.h>

       int statvfs(const char *path, struct statvfs *buf);
       int fstatvfs(int fd, struct statvfs *buf);

DESCRIPTION

       The function statvfs() returns information about a mounted file system.
       path is the path name of any file within the mounted  filesystem.   buf
       is a pointer to a statvfs structure defined approximately as follows:

         struct statvfs {
           unsigned long  f_bsize;    /* file system block size */
           unsigned long  f_frsize;   /* fragment size */
           fsblkcnt_t     f_blocks;   /* size of fs in f_frsize units */
           fsblkcnt_t     f_bfree;    /* # free blocks */
           fsblkcnt_t     f_bavail;   /* # free blocks for non-root */
           fsfilcnt_t     f_files;    /* # inodes */
           fsfilcnt_t     f_ffree;    /* # free inodes */
           fsfilcnt_t     f_favail;   /* # free inodes for non-root */
           unsigned long  f_fsid;     /* file system ID */
           unsigned long  f_flag;     /* mount flags */
           unsigned long  f_namemax;  /* maximum filename length */
         };

       Here  the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>.
       Both used to be unsigned long.

       The field f_flag is a bit mask (of mount flags,  see  mount(8)).   Bits
       defined by POSIX are

       ST_RDONLY
              Read-only file system.

       ST_NOSUID
              Set-user-ID/set-group-ID bits are ignored by exec(2).

       It  is  unspecified  whether  all  members  of the returned struct have
       meaningful values on all filesystems.

       fstatvfs() returns the same information about an open  file  referenced
       by descriptor fd.

RETURN VALUE

       On  success,  zero is returned.  On error, -1 is returned, and errno is
       set appropriately.

ERRORS

       EACCES (statvfs()) Search permission is denied for a component  of  the
              path prefix of path.  (See also path_resolution(2).)

       EBADF  (fstatvfs()) fd is not a valid open file descriptor.

       EFAULT Buf or path points to an invalid address.

       EINTR  This call was interrupted by a signal.

       EIO    An I/O error occurred while reading from the file system.

       ELOOP  (statvfs())   Too   many  symbolic  links  were  encountered  in
              translating path.

       ENAMETOOLONG
              (statvfs()) path is too long.

       ENOENT (statvfs()) The file referred to by path does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The file system does not support this call.

       ENOTDIR
              (statvfs()) A component of the path prefix  of  path  is  not  a
              directory.

       EOVERFLOW
              Some  values  were  too  large to be represented in the returned
              struct.

CONFORMING TO

       Solaris, Irix, POSIX 1003.1-2001

NOTES

       The Linux kernel has system calls statfs()  and  fstatfs()  to  support
       this library call.

       The current glibc implementation of

          pathconf(path, _PC_REC_XFER_ALIGN);
          pathconf(path, _PC_ALLOC_SIZE_MIN);
          pathconf(path, _PC_REC_MIN_XFER_SIZE);

       uses  the f_frsize, f_frsize, and f_bsize fields of the return value of
       statvfs(path,buf).

SEE ALSO

       statfs(2)